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27 Oct 2025, 00:51
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62% (01:43) correct
38%
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based on 195
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Drivers of SUVs drive much more carefully today than did SUV drivers in the 1980s. An examination of the number of SUV turn-overs per 1,000 vehicles per annum shows a decrease of 20% from the mid 1980s to the early 2000s.
Which of the following, if true, casts the most doubt on the claim that the average SUV driver of the early 2000s drives more carefully than the SUV driver of the 1980s did?
A. The number of SUV's on the streets of the United States today is twice that of the mid 1980s.
B. The number of SUVs on the streets of the United States today is 20% less than it was in the mid 1980s.
C. Extensive studies, showing that American truck drivers drove less carefully in the early 2000s than they used to in the mid 1980s, included a decrease of approximately 20% in the number of turn-overs between the mid 1980s and early 2000s.
D. SUVs were used in the 1980s primarily for off-road driving, whereas today SUVs are used mainly for road driving, which is less prone to tip-overs.
E. A thorough examination of the reasons underlying each accident shows that tip-overs account for only 1/5 of car accidents resulting in serious or mortal wounds.
Which of the following, if true, casts the most doubt on the claim that the average SUV driver of the early 2000s drives more carefully than the SUV driver of the 1980s did?
A. The number of SUV's on the streets of the United States today is twice that of the mid 1980s.
B. The number of SUVs on the streets of the United States today is 20% less than it was in the mid 1980s.
C. Extensive studies, showing that American truck drivers drove less carefully in the early 2000s than they used to in the mid 1980s, included a decrease of approximately 20% in the number of turn-overs between the mid 1980s and early 2000s.
D. SUVs were used in the 1980s primarily for off-road driving, whereas today SUVs are used mainly for road driving, which is less prone to tip-overs.
E. A thorough examination of the reasons underlying each accident shows that tip-overs account for only 1/5 of car accidents resulting in serious or mortal wounds.
27 Oct 2025, 14:37
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D. If SUVs in the 1980s were driven off-road more often (where rollovers are more likely) but in the 2000s are driven mainly on roads (where rollovers are less likely), the observed 20% drop in rollovers per 1,000 vehicles could be due to changes in how and where SUVs are used, not to drivers being more careful. That most directly undermines the claim about drivers' relative carefulness.
02 Nov 2025, 12:45
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OFFICIAL EXPLANATION
Drivers of SUVs drive much more carefully today than did SUV drivers in the 1980s. An examination of the number of SUV turn-overs per 1,000 vehicles per annum shows a decrease of 20% from the mid 1980s to the early 2000s.
Which of the following, if true, casts the most doubt on the claim that the average SUV driver of the early 2000s drives more carefully than the SUV driver of the 1980s did?
A. The number of SUV's on the streets of the United States today is twice that of the mid 1980s.
Incorrect.
To solve this Conclusion Weakening question, first break down the argument. The conclusion in the argument is tricky to spot. Firstly, it appears before the premise; and secondly, it has none of the indicators we learned about - no conjunctions, indicative verbs, or a tone of recommendation. Nevertheless, seeing as the second sentence of the argument is a piece of factual information (a premise) and that the first sentence of the argument seems to rely on that information, we can identify the first sentence as the conclusion:
Premise A: the number of SUV turn-overs has decreased from the mid 1980s to the early 2000s
=
Conclusion: SUV drivers of the 2000s are more careful than those of the 1980s
Possible assumption: SUVs of the 2000s and SUVs of the 1980s are comparable ( i.e., they are used for the same purposes by similar people and are technologically similar)
Weakening Data: ?
You are required to find data that weakens the conclusion that the SUV drivers have become more careful. The correct answer could be one that exposes the argument's assumption.
This answer choice neither weakens nor strengthens the conclusion. The 20% drop was seen in the percentages of SUV turn-overs ("per 1,000 vehicles per annum"), not in the number of turn-overs. Therefore, any changes in the total number of vehicles on the road are irrelevant and cannot affect the argument's conclusion.
B. The number of SUVs on the streets of the United States today is 20% less than it was in the mid 1980s.
Incorrect.
This answer choice neither weakens nor strengthens the conclusion. The 20% drop was seen in the percentages of SUV turn-overs ("per 1,000 vehicles per annum"), not in the number of turn-overs. Therefore, any changes in the total number of vehicles on the road are irrelevant and cannot affect the argument's conclusion. This answer choice copies the '20%' in order to trick you.
C. Extensive studies, showing that American truck drivers drove less carefully in the early 2000s than they used to in the mid 1980s, included a decrease of approximately 20% in the number of turn-overs between the mid 1980s and early 2000s.
Incorrect.
This answer choice neither weakens nor strengthens the conclusion. An example of similar data with different results can only seriously weaken a conclusion if the data discusses a similar subject. As SUVs and trucks differ, data concerning one cannot affect a conclusion concerning the other.
D. SUVs were used in the 1980s primarily for off-road driving, whereas today SUVs are used mainly for road driving, which is less prone to tip-overs.
This answer choice provides an alternate explanation for the data in the premise - always a great way of weakening the conclusion. If SUV drivers are using the road instead of driving up steep inclines, they are likely to tip over less, even if they are not driving more carefully.
E. A thorough examination of the reasons underlying each accident shows that tip-overs account for only 1/5 of car accidents resulting in serious or mortal wounds.
Incorrect.
To solve this Conclusion Weakening question, first break down the argument. The conclusion in the argument is tricky to spot. Firstly, it appears before the premise; and secondly, it has none of the indicators we learned about - no conjunctions, indicative verbs, or a tone of recommendation. Nevertheless, seeing as the second sentence of the argument is a piece of factual information (a premise) and that the first sentence of the argument seems to rely on that information, we can identify the first sentence as the conclusion:
Premise A: the number of SUV turn-overs has decreased from the mid 1980s to the early 2000s
=
Conclusion: SUV drivers of the 2000s are more careful than those of the 1980s
Possible assumption: SUVs of the 2000s and SUVs of the 1980s are comparable ( i.e., they are used for the same purposes by similar people and are technologically similar)
Weakening Data: ?
You are required to find data that weakens the conclusion that the SUV drivers have become more careful. The correct answer could be one that exposes the argument's assumption.
This answer choice neither weakens nor strengthens the conclusion. The part tip-overs have in serious or fatal accidents as a whole does not imply anything about the safety of driving (the conclusion) and does not help explain the decline in the precentage of tip-overs (the premise). This answer choice attempts to trick you by converting 20% to 1/5, but it is irrelevant to the argument.
